Long-term Evolution of Nonthermal Emission from Type Ia and Core-collapse Supernova Remnants in a Diversified Circumstellar Medium

• Published in: The Astrophysical journal Vol. 936; no. 1; pp. 26 - 45
• Main Authors: Kobashi, Ryosuke, Yasuda, Haruo, Lee, Shiu-Hang
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.09.2022; IOP Publishing
• Subjects: Astrophysics; Broadband; Circumstellar matter; Cosmic ray showers; Cosmic rays; Damping; Emission; Emissions; Energy budget; Evolution; Galactic cosmic rays; Gas density; Interstellar medium; Non-thermal radiation sources; Progenitors (astrophysics); Red giant stars; Stellar evolution; Stellar winds; Supergiant stars; Supernova; Supernova remnants; Wave damping
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/ac80f9

Abstract The contribution of galactic supernova remnants (SNRs) to the origin of cosmic rays (CRs) is an important open question in modern astrophysics. Broadband nonthermal emission is a useful proxy for probing the energy budget and production history of CRs in SNRs. We conduct hydrodynamic simulations to model the long-term SNR evolution from explosion all the way to the radiative phase (or 3 × 10 5 yr at maximum) and compute the time evolution of the broadband nonthermal spectrum to explore its potential applications on constraining the surrounding environments, as well as the natures and mass-loss histories, of the SNR progenitors. A parametric survey is performed on the ambient environments separated into two main groups, namely, a homogeneous medium with a uniform gas density and one with the presence of a circumstellar structure created by the stellar wind of a massive red supergiant progenitor star. Our results reveal a highly diverse evolution history of the nonthermal emission closely correlated to the environmental characteristics of an SNR. Up to the radiative phase, the roles of CR reacceleration and ion−neutral wave damping on the spectral evolution are investigated. Finally, we make an assessment of the future prospect of SNR observations by the next-generation hard X-ray space observatory FORCE and predict what we can learn from their comparison with our evolution models.